CN111842796A - Be used for as cast core of valve body and valve body wax matrix moulded die - Google Patents

Abstract

The invention relates to a core for valve casting and a valve wax pattern forming die, which comprises an upper die, a lower die and a core, wherein the upper die is buckled on the lower die, a cavity is formed at the joint surface of the upper die and the lower die, the cavity is communicated with the outside through a wax injection port on the side wall, the cavity is communicated with the outside through a first mounting hole, a second mounting hole and a third mounting hole, the first core for forming a runner on a stop valve is matched in the first mounting hole, the second core for forming a valve rod hole of the stop valve is matched in the second mounting hole, the third core for forming a runner under the stop valve is matched in the third mounting hole, a lateral forming concave surface is arranged at one end, close to the second core, of the first core and matched with a lateral bulge on the second core, a locking rod extending along the axial direction of the second core is arranged in the second core, the inward extending end of the locking rod penetrates through a cylinder body for forming the valve rod hole and is, two end faces of the cylinder respectively abut against the second mold core and the third mold core.

Description

Be used for as cast core of valve body and valve body wax matrix moulded die

Technical Field

The invention relates to a molding device, in particular to a mold core for valve body casting and a valve body wax pattern molding die.

Background

The stop valve can be used for controlling the flow of various types of fluid such as air, water, steam, various corrosive media, slurry, oil and the like. Is very suitable for cutting off and throttling. The valve rod of the valve has relatively short opening or closing stroke and reliable cut-off function. Usually, a valve body of the stop valve is cast by a lost wax method, a wax pattern copying with a finished product needs to be manufactured in the process of casting by the lost wax method, referring to fig. 9, the wax pattern 100 of the valve body in the traditional casting process is formed by combining and welding a plurality of blocks, a plurality of molds are needed to respectively form each block, the wax pattern is manufactured by adopting the mode, the process steps are multiple, the cost is high, workpieces are transferred among a plurality of stations and the introduction of a welding process can cause the consistency of the whole product to be reduced, and great quality risks exist.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a core for valve body casting and a valve body wax pattern forming die, which can complete wax pattern forming at one time, improve the consistency of products, reduce process steps and reduce production cost.

The purpose of the invention is realized as follows: the utility model provides a core for valve body casting, includes the base, set up central core-pulling block on the base, the central core-pulling block includes the prism section, the cross section of central core-pulling block is for being the polygon, and every interior angle of polygon equals or is greater than 90 and be less than 180, the lateral wall of central core-pulling block passes through unsmooth cooperation structural connection parting block, and the surface that exposes outward of every parting block sets up the profile, smooth transition between the profile of adjacent core-pulling block, the fixed tailstock of afterbody connection of prism section, the afterbody of parting block supports and leans on the terminal surface at the positioning seat.

The side surface of each central core-pulling block is provided with an axially extending convex block, the matching surface of each parting block facing the side surface of the prism is provided with a groove, and the convex block and the groove are matched to form a concave-convex matching structure.

The cross section of the prism section is rectangular, the left side surface of the prism section is matched with a left side parting block, the right side surface of the prism section is matched with a right side parting block, the upward extending part of the left side parting block and the upward extending part of the right side parting block are opposite and the upper side surface of the prism section is enclosed to form a first mounting groove, an upper side molding block is embedded and fixed in the first mounting groove, a second mounting groove is enclosed by the opposite surfaces of the downward extension part of the left side molding block and the downward extension part of the right side molding block and the lower side surface of the prismatic section, a fixed lower side parting block is embedded in the second mounting groove, the projection height of the upper side parting block on a plane vertical to the extending direction of the prism is smaller than the rectangular height, the projection height of the lower parting block on a plane vertical to the extending direction of the prism is less than the rectangular height, the projection width of the left side parting block on a plane vertical to the extending direction of the prism is smaller than the width of the rectangle; the right side face of the prism section is matched with the right side parting block, and the projection width of the right side parting block on a plane vertical to the extending direction of the prism is smaller than the width of the rectangle.

The left side surface of the prismatic section is provided with a first dovetail convex block and a second dovetail convex block which are convex laterally, the two dovetail convex blocks are symmetrical around a rectangular central line, the first dovetail convex block is connected with the first left side parting block through a concave-convex matching structure, the second dovetail convex block is connected with the second left side parting block through a concave-convex matching structure, the first left side parting block and the second left side parting block are butted through a horizontal straight surface, the horizontal flat surface passes through the axis of the rectangle, the right side surface of the prism section is provided with a third dovetail convex block and a fourth dovetail convex block which are convex laterally, the two dovetail convex blocks are symmetrical around the horizontal midline of the rectangle, the third dovetail convex block is connected with the third right side parting block through a concave-convex matching structure, the fourth dovetail convex block is connected with the fourth right side parting block through a concave-convex matching structure, the fourth right side parting block is butted with the third right side parting block through a horizontal flat surface, and the horizontal flat surface passes through the rectangular axis.

The groove is a dovetail groove or an inverted trapezoidal groove.

A valve body wax pattern forming die comprises an upper die, a lower die and the core, wherein the upper die is buckled on the lower die, a die cavity is formed at the joint surface of the upper die and the lower die, the die cavity is communicated with the outside through a wax injection port on the side wall, the die cavity is communicated with the outside through a first mounting hole, a second mounting hole and a third mounting hole, a third core used for forming a lower runner of a stop valve is matched in the third mounting hole, a first core is matched in the first mounting hole, a second core used for forming a valve rod hole of the stop valve is matched in the second mounting hole, an inward extending section of the first core and an inward extending section of the second core are spliced to form an upper runner core, the upper runner core is used for forming an upper runner of the stop valve, the splicing line of the inward extending end of the first core and the inward extending end of the second core is positioned at the bending part of the upper runner core, a locking rod extending along the axial direction of the second core is arranged in the second core, the inner extending end of the locking rod penetrates through a cylinder used for forming the valve flap hole and is fixedly connected with a corresponding connecting hole in the third mold core, and two end faces of the cylinder are respectively abutted against the second mold core and the third mold core.

And one end of the first mold core, which is close to the second mold core, is provided with a lateral molding concave surface which is matched with the lateral bulge on the second mold core.

The included angle A between the axis of the bottom of the lateral forming concave surface and the axis of the second type mandrel is 20-60 degrees.

And projections of the parting blocks on the second core along the axial direction of the second core interfere with the end surface of the cylinder respectively.

The utility model provides a core for valve body casting, includes the base, set up central core-pulling block on the base, the central core-pulling block includes the prism section, the cross section of central core-pulling block is for being the polygon, and every interior angle of polygon equals or is greater than 90 and be less than 180, the lateral wall of central core-pulling block passes through unsmooth cooperation structural connection parting block, and the surface that exposes outward of every parting block sets up the profile, smooth transition between the profile of adjacent core-pulling block, the fixed tailstock of afterbody connection of prism section, the afterbody of parting block supports and leans on the terminal surface at the positioning seat. By adopting the scheme, the core assembling method has the advantages that before molding and core assembling, a plurality of parting blocks are assembled on the prism section through the concave-convex matching structure, each internal angle is equal to or more than 90 degrees and less than 180 degrees, the parting blocks can be adjusted in the cavity formed after the core pulling of the central core pulling block by adopting the structure, the space blocking effect of the inner wall of the cavity on the parting blocks is minimum, the cavity with a triangular section or the cavity with a concave-polygonal section is avoided, the size of the parting blocks can be large enough as much as possible, the parting blocks can be conveniently pulled and separated to reduce the joint seam while the number of the parting blocks is reduced, after the parting blocks are spliced, the whole core can be in an integral structure, the whole core is molded as a whole in the whole molding process, after the wax is molded, because the core is in a structure with a small upper opening and a large opening, and after the molding is completed, the central core-pulling block is firstly extracted, a cavity which is in a shape similar to the central core-pulling block is formed after extraction, and all the parting blocks are sequentially extracted from the cavity which is in the shape. By adopting the invention, the complete molding of the cavity structure of the wax pattern can be completed at one time, and the welding of a plurality of wax patterns is not needed, thus improving the consistency of products, reducing process steps and lowering production cost.

A valve body wax pattern forming die comprises an upper die, a lower die and the die core, wherein the upper die is buckled on the lower die, a die cavity is formed at the joint surface of the upper die and the lower die, the die cavity is communicated with the outside through a wax injection port on the side wall, the die cavity is communicated with the outside through a first mounting hole, a second mounting hole and a third mounting hole, a third die core used for forming a lower runner of a stop valve is matched in the third mounting hole, a first die core is matched in the first mounting hole, a second die core used for forming a valve rod hole of the stop valve is matched in the second mounting hole, an inward extending section of the first die core and an inward extending section of the second die core are spliced to form an upper runner die core, the upper runner die core is used for forming an upper runner of the stop valve, the splicing line of the inward extending end of the first die core and the inward extending end of the second die core is positioned at the bending part of the upper runner die core, a locking rod extending along the axial direction, the inner extending end of the locking rod penetrates through a cylinder used for forming the valve flap hole and is fixedly connected with a corresponding connecting hole in the third mold core, and two end faces of the cylinder are respectively abutted against the second mold core and the third mold core. And one end of the first mold core, which is close to the second mold core, is provided with a lateral molding concave surface which is matched with the lateral bulge on the second mold core. The valve clack hole forming die has the advantages that after the cores are assembled, the first core, the second core and the third core are fixed on the lower die and connected with the third core and the second core through the locking rods, the cylinders used for forming the valve clack holes are clamped tightly by the third core and the second core, and after the locking rods are connected and fixed, the second core, the third core and the cylinders are positioned and fixed. Because, the opening and closing piece of manual stop valve is the valve clack of stopper shape, the linear motion is made along the central line of disk seat to the valve clack, adopt the cylinder to connect alone and be used for the valve clack hole of shaping valve body at the front end of first core, can guarantee the shaping precision and the surface shaping quality in whole valve clack hole, can avoid adopting the precision difference that the block structure leads to, the surface shaping quality is poor, there are defects such as overlap, can guarantee the shaping precision in whole valve clack hole, sufficient shaping precision can show the leakproofness that improves the finished product valve. The utility model discloses a runner core, including first core, second core, runner core, first core, second core. The one end that first core is close to the second core sets up the side direction shaping concave surface and coincide with the side direction arch on the second core, adopts this kind of structure, and is first can make things convenient for the butt joint of first core, second core, makes things convenient for the second core, location between the third core, and the last parting block that adopts this kind of structure can make things convenient for first core has sufficient up-and-down motion space when the operation of loosing core simultaneously, goes up the parting block when the downstream, can not interfere the baffle between last runner and the lower runner in the wax matrix. Because the upper flow passage and the lower flow passage are overlapped in the vertical direction, if the structure of the second core and the structure of the third core are simply adopted, a cylinder for forming a valve clack hole of the valve body cannot be arranged, and core pulling operation of the cylinder, the second core and the second core cannot be finished.

Drawings

FIG. 1 is a schematic diagram of one embodiment of a valve body core;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a schematic view of an embodiment of a wax pattern forming die for a valve body;

FIG. 4 is a cross-sectional view taken at A-A of FIG. 3;

FIG. 5 is a schematic view of the core of FIG. 3 engaged with a wax valve body;

FIG. 6 is a schematic view of the arrangement of cores of FIG. 3;

FIG. 7 is a schematic structural view of a lateral projection;

FIG. 8 is a schematic view of the engagement of the lateral protrusions with the lateral molding concavities;

fig. 9 is a schematic structural diagram of a valve body wax pattern.

In the drawing, 10 is a base, 2 is a lower die, 3 is an upper die, 4 is a molding cavity, 6 is a locking rod, 7 is a cylinder, 11 is a central core-pulling block, 121 is a left-side parting block, 122 is a right-side parting block, 123 is an upper-side parting block, 124 is a lower-side parting block, 1211 is a first left-side parting block, 1212 is a second left-side parting block, 1221 is a third right-side parting block, 1222 is a fourth right-side parting block, 11c is a prism section, 1c is a first core, 1b is a second core, 1a is a third core, a is a dovetail projection, a1 is a first dovetail projection, a2 is a second dovetail projection, b is a groove, e is a lateral molding concave surface, f is a lateral projection, and 100 is a valve body wax pattern.

Detailed Description

Specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to fig. 1, an embodiment of a valve body core includes a base 10, a central core-pulling block 11 is disposed on the base 10, the central core-pulling block 11 includes a prism section 11c, a cross section of the central core-pulling block 11 is polygonal, each internal angle of the polygon is equal to or greater than 90 ° and less than 180 °, an outer side wall of the central core-pulling block 11 is connected with a parting block 12 through a concave-convex matching structure, an exposed surface of each parting block 12 is provided with a forming surface, the forming surfaces of adjacent core-pulling blocks are in smooth transition, a tail of the prism section 11c is connected with a fixed tailstock 12, and a tail of the parting block 12 abuts against an end surface of the positioning seat. Preferably. Every center core-pulling block 11 side sets up axially extended lug a, and every parting block 12 sets up recess b towards the fitting surface of prismatic side, and the lug cooperates with recess b and forms unsmooth cooperation structure, adopts this kind of structure, and the back is loosed core to center core-pulling block 11, both can let to keep somewhere bigger space of loosing core, also can reduce the volume of individual parting block 12 as far as simultaneously, makes things convenient for each parting block 12 to loose core.

In this embodiment, the cross section of the prism section may be rectangular, the left side parting block 121 is fitted on the left side of the prism section, the right side parting block 122 is fitted on the right side of the prism section, a first mounting groove is defined by the facing surface of the upward extending portion of the left side parting block 121 and the upward extending portion of the right side parting block 122 and the upper side surface of the prism section, the fixed upper parting block 123 is embedded in the first mounting groove, a second mounting groove is defined by the facing surface of the downward extending portion of the left side parting block 121 and the downward extending portion of the right side parting block 122 and the lower side surface of the prism section, the fixed lower parting block 124 is embedded in the second mounting groove, the projection height of the upper parting block 12 on the plane perpendicular to the prism extending direction is smaller than the rectangular height, the projection height of the lower parting block 124 on the plane perpendicular to the prism extending direction is smaller than the rectangular height, and the projection width of the left side parting block 121 on the plane perpendicular to the prism extending direction is smaller than the rectangular width (ii) a The utility model discloses a core drawing device, including prismatic section, right side parting block 122, central core drawing block 11, the right side parting block 123 of the cooperation, right side parting block 122 is less than the rectangle width on the plane perpendicular with prismatic extending direction, adopt this kind of arrangement structure convenience to loose core at central core drawing block 11 after, can keep somewhere enough big high space, make things convenient for going up side parting block 123 or downside parting block 124 after the centripetal motion to loose core, adopt this kind of structure can central core drawing block 11 to carry out complete cladding simultaneously, the side of central core drawing block 11 does not set up the profiled surface, the seam number of whole core has been reduced, be favorable to reducing the overlap that produces in the time of the shaping, be favorable to improving the shaping quality of profiled surface, the second mounting groove, first mounting groove can go up side parting block 123. The lower side parting block 124 is tightly matched after being installed, the force application directions of the concave-convex matching structures on the upper side surface, the lower side surface and the left side surface and the right side surface of the rectangle are vertical, so that the matching structure of the parting block 12 and the central core-pulling block 11 of the whole core is more compact, the forming surface of the whole core is more stable, and the forming quality is higher. Further, the left side surface of the prism section is provided with a first dovetail projection a1 and a second dovetail projection a2 of the lateral protrusion f, the two dovetail projections a are symmetrical about a rectangular central line, the first dovetail projection a1 is connected with the first left parting block 1211 by a concave-convex matching structure, the second dovetail projection a2 is connected with the second left parting block 1212 by a concave-convex matching structure, the first left parting block 1211 is butted with the second left parting block 1212 by a horizontal flat surface which passes through a rectangular axis, the right side surface of the prism section is provided with a third dovetail projection a and a fourth dovetail projection a of the lateral protrusion f, the two dovetail projections a are symmetrical about the rectangular horizontal central line, the third dovetail projection a is connected with the third right parting block 1221 by a concave-convex matching structure, the fourth projection a is connected with the fourth right parting block 1222 by a concave-convex matching structure, the fourth right dovetail block 1222 is butted with the third right parting block 1221 by a horizontal flat surface, the horizontal flat surface passes through the rectangular axis, and the structure can split the lateral parting block 12 into smaller volume, so that the core pulling space left after the core pulling of the central core pulling block 11 is more convenient.

Referring to fig. 1 to 9, an embodiment of a wax pattern forming die for a valve body comprises an upper die 3, a lower die 2 and cores in the above embodiments, wherein the upper die 3 is fastened on the lower die 2, a cavity 4 is formed at a joint surface of the upper die 3 and the lower die 2, the cavity 4 is communicated with the outside through a wax injection port of a side wall, the cavity 4 is communicated with the outside through a first mounting hole 41, a second mounting hole 42 and a third mounting hole 43, a third core 1a for forming a lower runner of a stop valve is matched in the third mounting hole 43, an inclined slope of a forming partition plate is arranged at one end of the third core 1a facing to a first core 1c, the first core 1c is matched in the first mounting hole 41, a second core 1b for forming a valve rod hole of the stop valve is matched in the second mounting hole 42, an inwardly extending section of the first core and an inwardly extending section of the second core are spliced to form an upper runner, go up the runner core and be used for the last runner of shaping stop valve, the interior amalgamation line that stretches the end of stretching end and the interior of second core of first core is located the department of buckling of runner core, set up in second core 1b along the locking lever 6 of second core 1b axial extension, the interior end of stretching of locking lever 6 passes the cylinder 7 that is used for the shaping valve lamella hole and is connected fixedly with the connecting hole that corresponds on the third core 1a, the end of locking lever can set up the external screw thread, and the external screw thread is fixed with connecting hole internal thread jogged joint, the both ends face of cylinder supports respectively and leans on second core and third core. Further, a lateral forming concave surface e is arranged at one end, close to the second mold core 1b, of the first mold core 1c and is matched with a lateral bulge f on the second mold core 1b, and an included angle A between the axis of the bottom of the lateral forming concave surface e and the axis of the second mold core 1b is 20-60 degrees. By adopting the arrangement structure, the arrangement structure of the first core and the second core can be optimized, and core pulling is convenient. Each parting block on the second core interferes with the end face of the cylinder respectively along the axial projection of the second core, and the adoption of the structure can axially limit each parting block on the second core in the axial direction and prevent each parting block from moving in the axial direction.

Before the valve body wax pattern 100 is formed by adopting the scheme, the parting blocks 12 are assembled on the corresponding central core-pulling blocks 11, the cylinder 7 is sleeved on the locking rod, the third core 1a and the second core 1b are locked through the locking rod, the first core 1c is assembled, after the core is assembled, the mold is buckled, the molding wax is injected through the wax injection port, after the molding wax is formed, the central core-pulling blocks of the first core 1c are pulled out, the parting blocks 12 are gradually pulled out, the locking rod is loosened, the second core and the third core are respectively pulled out, the cylinder 7 is taken out, and the core pulling of the whole valve body is completed.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it is apparent that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (9)

1. A core for casting a valve body, comprising: including base (10), set up central core-pulling piece (11) on base (10), central core-pulling piece (11) includes prism section (11c), the cross section of central core-pulling piece (11) is for being the polygon, and every interior angle of polygon equals or is greater than 90 and be less than 180, the lateral wall of central core-pulling piece (11) passes through unsmooth cooperation structure and connects parting piece (12), and the exposed face of every parting piece (12) sets up the profiled surface, smooth transition between the profiled surface of adjacent parting piece, tail connection fixed tailstock (12) of prism section (11c), the afterbody of parting piece (12) supports and leans on the terminal surface at the positioning seat.

2. A core for valve body casting according to claim 1, wherein: the side surface of each central core-pulling block (11) is provided with a projection (a) extending axially, the matching surface of each parting block (12) facing the side surface of the prism is provided with a groove (b), and the projection and the groove (b) are matched to form a concave-convex matching structure.

3. A core for valve body casting according to claim 1, wherein: the cross section of the prism section is rectangular, a left side parting block (121) is matched on the left side surface of the prism section, a right side parting block (122) is matched on the right side surface of the prism section, a first mounting groove is formed by the upward extension part of the left side parting block (121), the opposite surface of the upward extension part of the right side parting block (122) and the upper side surface of the prism section in a surrounding manner, a fixed upper side parting block (123) is embedded in the first mounting groove, a second mounting groove is formed by the downward extension part of the left side parting block (121), the opposite surface of the downward extension part of the right side parting block (122) and the lower side surface of the prism section in a surrounding manner, a fixed lower side parting block (124) is embedded in the second mounting groove, the projection height of the upper side parting block (12) on a plane vertical to the prism extension direction is smaller than the rectangular height, and the projection height of the lower side parting block (124) on a plane vertical to the extension direction is smaller than the rectangular height, the projection width of the left side parting block (121) on a plane vertical to the extending direction of the prism is smaller than the width of the rectangle; the right side face of the prism section is matched with a right side parting block (122), and the projection width of the right side parting block (122) on a plane vertical to the extending direction of the prism is smaller than the width of the rectangle.

4. A core for valve body casting according to claim 3, wherein: the left side surface of the prism section is provided with a first dovetail projection (a1) and a second dovetail projection (a2) of a lateral bulge (f), the two dovetail projections (a) are symmetrical about a rectangular central line, the first dovetail projection (a1) is connected with a first left parting block (1211) through a concave-convex matching structure, the second dovetail projection (a2) is connected with a second left parting block (1212) through a concave-convex matching structure, the first left parting block (1211) is butted with the second left parting block (1212) through a horizontal flat surface which passes through a rectangular axis, the right side surface of the prism section is provided with a third dovetail projection (a) and a fourth dovetail projection (a) of the lateral bulge (f), the two dovetail projections (a) are symmetrical about a rectangular horizontal central line, the third dovetail projection (a) is connected with a third right parting block (1221) through a concave-convex matching structure, the fourth dovetail projection (a) is connected with a fourth right parting block (1222) through a concave-convex matching structure, the fourth right parting block (1222) is butted against the third right parting block (1221) by a horizontal flat surface that passes through the center of the rectangle.

5. A core for valve body casting and a valve body wax pattern molding die as claimed in claims 1 to 4, wherein: the groove (b) is a dovetail groove or an inverted trapezoidal groove.

6. The utility model provides a valve body wax pattern moulded die which characterized in that: the mold core comprises an upper mold (3), a lower mold (2) and the mold core as claimed in claims 1-5, wherein the upper mold (3) is buckled on the lower mold (2), a mold cavity (4) is formed at the joint surface of the upper mold (3) and the lower mold (2), the mold cavity (4) is communicated with the outside through a wax injection port of a side wall, the mold cavity (4) is communicated with the outside through a first mounting hole (41), a second mounting hole (42) and a third mounting hole (43), a third mold core (1a) used for forming a lower runner of a stop valve is matched in the third mounting hole (43), a first mold core (1c) is matched in the first mounting hole (41), a second mold core (1b) used for forming a valve rod hole of the stop valve is matched in the second mounting hole (42), an inner extension section of the first mold core and an inner extension section of the second mold core are spliced to form an upper runner mold core, and the upper runner mold core is used for forming an upper runner of the, the utility model discloses a valve core, including first core, second core, connecting hole, the first core stretches in the end of first core and the amalgamation line of the end of stretching in of second core are located the department of buckling of runner core, set up in second core (1b) along second core (1b) axial extension's locking lever (6), the end of stretching in of locking lever (6) passes cylinder (7) that are used for the shaping valve lamella hole and is connected fixedly with the connecting hole that corresponds on third core (1a), the both ends face of cylinder supports respectively and leans on second core and third core.

7. The valve body wax pattern molding die as defined in claim 6, wherein: one end of the first mold core (1c) close to the second mold core (1b) is provided with a lateral molding concave surface (e) which is matched with a lateral bulge (f) on the second mold core (1 b).

8. A valve body wax pattern molding die as claimed in claim 7, a core for valve body casting, characterized in that: the included angle A between the axis of the groove bottom of the lateral forming concave surface (e) and the axis of the second mold core (1b) is 20-60 degrees.

9. A valve body wax pattern molding die as claimed in claim 6, a core for valve body casting, characterized in that: and projections of the parting blocks on the second core along the axial direction of the second core interfere with the end surface of the cylinder respectively.

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